Our Mrs. Reynolds

The episode of Firefly, "Our Mrs. Reynolds", had many interesting scenes with implicit meanings, but I want to take a closer look at the bedroom scene. In this scene, Mr. Reynolds walks into his bedroom to find his new wife lying in bed completely naked. They had just married and Mr. Reynolds had no intention of keeping her as his wife and had told her such; yet, you have this young, innocent girl lying in his bed. This seems a little odd, even if she is just trying to please her new husband. What is the point of giving herself to this man if she will no longer be with him in just a few short days? Shouldn't she wait til she arrives at her destination to find a new husband who wants to be with her? These were the first things that I thought of when this was happening. A girl like this should have been terrified, but instead she seemed very eager, almost too eager. When Mr. Reynolds told her that it was morrally wrong and that he wouldn't do it, she became even more aggressive. She got up out of the bed and went over to Mr. Reynolds and was trying to persuade him. Mr. Reynolds finally gave in and started kissing his new wife. This is when the scene gets even more interesting; while kissing her, Mr. Reynolds steps back, says "that was interesting", and falls to the ground. His new wife had just poisoned him with her lips. This part is very ironic; just when Mr. Reynolds gives in to his new wife and goes against his morals, he gets poisoned. Could the writer possibly be trying to tell the viewer something here?